linux-kernel - [PATCH] [6/9] GBPAGES: Add gbpages support to lookup

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Date:	Tue, 29 Jan 2008 06:06:34 +0100 (CET)
From:	Andi Kleen <ak@...e.de>
To:	mingo@...e.hu, tglx@...utronix.de, linux-kernel@...r.kernel.org
Subject: [PATCH] [6/9] GBPAGES: Add gbpages support to lookup_address


Signed-off-by: Andi Kleen <ak@...e.de>

---
 arch/x86/mm/pageattr.c    |    5 +++++
 include/asm-x86/pgtable.h |    1 +
 2 files changed, 6 insertions(+)

Index: linux/arch/x86/mm/pageattr.c
===================================================================
--- linux.orig/arch/x86/mm/pageattr.c
+++ linux/arch/x86/mm/pageattr.c
@@ -152,9 +152,14 @@ pte_t *lookup_address(unsigned long addr
 
 	if (pgd_none(*pgd))
 		return NULL;
+
+	*level = PG_LEVEL_1G;
 	pud = pud_offset(pgd, address);
 	if (pud_none(*pud))
 		return NULL;
+	if (pud_large(*pud))
+		return (pte_t *)pud;
+
 	pmd = pmd_offset(pud, address);
 	if (pmd_none(*pmd))
 		return NULL;
Index: linux/include/asm-x86/pgtable.h
===================================================================
--- linux.orig/include/asm-x86/pgtable.h
+++ linux/include/asm-x86/pgtable.h
@@ -242,6 +242,7 @@ enum {
 	PG_LEVEL_NONE,
 	PG_LEVEL_4K,
 	PG_LEVEL_2M,
+	PG_LEVEL_1G,
 };
 
 /*
--
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